Powder metallurgy press die facilitating discharge

Abstract

The application relates to the technical field of pressing molds, in particular to a powder metallurgy pressing mold facilitating discharging, which comprises a base, a lower mold and an upper mold which are sequentially arranged from bottom to top, a plurality of vertical columns are vertically arranged on the top surface of the base, the lower mold is fixedly connected with the vertical columns, the upper mold is in sliding cooperation with the vertical columns, a forming channel is vertically arranged in the middle position of the top surface of the lower mold, and a core block capable of sliding in the vertical direction is arranged in the forming channel; the core block is provided with a demolding assembly, when the core block is lifted to push out a formed product, the demolding assembly can be rotated first and then lifted, so that the product is separated from the surface of the core block, and the product can be easily taken down by the staff.

Description

Technical Field

[0001] This invention relates to the field of pressing mold technology, specifically to a powder metallurgy pressing mold that facilitates material discharge. Background Technology

[0002] Powder metallurgy, as a highly efficient and energy-saving material preparation process, has been widely used in the automotive, aerospace, and electronics industries. One of its core components is pressing powder into blanks with specific shapes and densities using a pressing mold. Compared to traditional casting methods, powder metallurgy technology has higher production efficiency.

[0003] Existing powder metallurgy pressing dies generally consist of an upper die, a lower die, a forming cavity located on the top surface of the lower die, and an ejection mechanism located within the forming cavity. In operation, a measured amount of powder is first poured into the forming cavity by machine or manually. Then, a hydraulic mechanism controls the lower die to press down, embedding it into the forming cavity. Finally, under the action of upper and lower extrusion pressure, the powder is pressed into shape. After pressing, the ejection mechanism pushes the formed product upwards out of the forming cavity. At this point, the product can be removed by machine or manually. The ejection mechanism then retracts back to its original position for reuse.

[0004] It is important to note that although pressing molds are convenient and efficient, the pressed products are not very robust and require high-temperature sintering; otherwise, they are likely to break easily. In the aforementioned process, after the powder is poured into the molding cavity, it falls onto the ejector mechanism. Under the pressure of the upper mold, the molded product may adhere tightly to the upper surface of the ejector mechanism, creating resistance to the unloading process. Specifically, although the upper surface of the ejector mechanism is smoothed, the immense pressing force can still cause adhesion between the molded product and the mechanism's upper surface. Forcibly removing the product with external force may result in uneven stress and surface damage. Therefore, this invention proposes a powder metallurgy pressing mold that facilitates unloading, effectively addressing these drawbacks. Summary of the Invention

[0005] The purpose of this invention is to provide a powder metallurgy pressing mold that facilitates material discharge, thereby solving the problem that the above-mentioned molded products may have difficulty in demolding due to excessive product adhesion during the demolding process.

[0006] The present invention is achieved through the following technical solution: a powder metallurgy pressing mold for easy material discharge, comprising a base, a lower mold and an upper mold arranged sequentially from bottom to top, wherein multiple columns are vertically arranged on the top surface of the base, the lower mold is fixedly connected to the columns, the upper mold is slidably fitted to the columns, and a forming channel is provided through the middle of the top surface of the lower mold, wherein a core block that can slide vertically is provided in the forming channel;

[0007] The upper module is provided on the bottom surface of the upper mold and directly opposite the molding channel. When the upper module extends into the molding channel, the upper module and the core block can work together to press the powder into a block.

[0008] The upper surface of the core block is provided with an annular demolding cavity, and a demolding component is provided inside the demolding cavity. In the powder pressing state, the top surface of the demolding component is flush with the upper surface of the core block.

[0009] The core block is also provided with a demolding drive assembly, which is used to control the demolding assembly to rotate and then lift during the upward lifting process of the core block, so that the pressed and formed product can be separated from the core block.

[0010] Optionally, a mandrel is vertically provided on the top surface of the base, and the top end of the mandrel extends into the molding channel and is flush with the top surface of the lower mold.

[0011] Optionally, the bottom end of the forming channel is provided with a bottom cover, and a tension spring that is always in a stretched state is connected between the bottom cover and the core block;

[0012] A pusher is provided between the base and the lower mold. A pusher and a puller are vertically provided on the top surface of the pusher. The top of the pusher penetrates the bottom cover and extends into the molding channel. The top of the pusher abuts against the bottom surface of the core block. The puller penetrates the lower mold and the top of the puller is connected to the upper mold by a traction rope.

[0013] Optionally, the demolding assembly includes a rotating part that is ring-shaped and a lifting part located above the rotating part, and multiple telescopic components are provided between the rotating part and the lifting part;

[0014] The outer surface of the lifting part is provided with a protruding post, and the inner surface of the demolding cavity is provided with a sliding groove for the protruding post to be inserted. The sliding groove includes a horizontal section and a spiral section. When the protruding post is located inside the horizontal section, the top surface of the lifting part is flush with the upper surface of the core block. When the protruding post enters the spiral section, the top surface of the lifting part is higher than the upper surface of the core block.

[0015] Optionally, the core block is further provided with an installation groove communicating with the demolding cavity, and the surface of the rotating part facing the installation groove is provided with a driven gear ring.

[0016] The demolding drive assembly includes a prime mover gear rotatably disposed in the mounting slot and meshing with the driven gear ring. The bottom of the core block is also provided with an extension hole communicating with the mounting slot. A main shaft is rotatably disposed in the extension hole. The top end of the main shaft is coaxially connected to the prime mover gear, and the bottom end of the main shaft extends out below the extension hole.

[0017] Optionally, the demolding drive assembly further includes a retainer disposed on the bottom surface of the core block, a retaining rod slidably disposed in the retainer along the vertical direction, a spiral groove is formed on the bottom outer surface of the main shaft, an adjustment groove is formed on one side of the inner wall of the forming channel along the vertical direction, and the two ends of the retaining rod are respectively embedded in the spiral groove and the adjustment groove;

[0018] A return spring is also provided between the retainer and the retaining rod. In its natural state, the return spring is in a compressed state, and the retaining rod is located at the upper end of the inside of the retainer. During the upward lifting of the core block, when the retaining rod abuts against the top of the adjusting groove, the retaining rod can move downward along the spiral groove to make the demolding assembly rotate.

[0019] Optionally, the upper surface of the core block is symmetrically provided with hidden cavities on both sides and near the edge. A lifting block is embedded in the hidden cavity. When the lifting block is fully embedded in the hidden cavity, the top surface of the lifting block is flush with the upper surface of the core block.

[0020] Optionally, a connecting groove is provided between the hidden cavity and the demolding cavity, a linkage rod is provided on the lifting block, and a ring-shaped drive groove is provided on the outer surface of the lifting part. One end of the linkage rod passes through the connecting groove and extends into the drive groove.

[0021] Optionally, the bottom end of the extension hole is provided with a rotating seat cover, and the main shaft is rotatably engaged with the rotating seat cover.

[0022] Optionally, the outer surface of the core block is provided with a mounting hole communicating with the hidden cavity. The mounting hole and the connecting groove are distributed opposite each other. The linkage rod is inserted into the lifting block through the mounting hole and is threadedly connected and fixed thereto.

[0023] Compared with the prior art, the present invention provides a powder metallurgy pressing mold that facilitates material discharge, and has the following beneficial effects:

[0024] 1. The core block of the present invention has a demolding component. When the core block rises to eject the molded product, the demolding component can rotate first and then lift, thereby separating the product from the surface of the core block, so that the workers can easily remove the product.

[0025] 2. The demolding assembly of the present invention includes a rotating part and a lifting part. When the lifting part rotates, the lifting part can first separate from the product, and then the lifting part rises to separate the product from the rest of the core block surface. This method enables the product to be demolded in stages, avoiding damage to the product surface caused by excessive demolding force at one time.

[0026] 3. The present invention also includes a lifting block, which can rise synchronously with the lifting part, so that the product is subjected to more uniform force when it is separated from the core block, and avoids damage to the product surface due to uneven force. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention;

[0028] Figure 2 This is a cross-sectional view of the first state structure of the present invention;

[0029] Figure 3 This is a cross-sectional view of the second state structure of the present invention;

[0030] Figure 4 This is a cross-sectional view of the third state structure of the present invention;

[0031] Figure 5 This is a schematic diagram of the first state structure of the chip of the present invention;

[0032] Figure 6 This is a schematic diagram of the second state structure of the chip of the present invention;

[0033] Figure 7 This is a schematic diagram of the internal state of the demolding cavity of the present invention;

[0034] Figure 8 This is a cross-sectional view of the first state of the chip of the present invention;

[0035] Figure 9 This is a cross-sectional view of the second state of the chip of the present invention;

[0036] Figure 10 This is a schematic diagram of the cage structure of the present invention;

[0037] Figure 11 This is a schematic diagram of the lifting part structure of the present invention;

[0038] Figure 12 for Figure 4 Enlarged view of point A in the middle;

[0039] Figure 13 for Figure 8 Enlarged view of the corresponding area at point B.

[0040] In the diagram: 100, base; 101, column; 102, pusher; 103, pusher column; 104, puller column; 105, traction rope; 200, lower mold; 201, bottom cover; 202, pull spring; 203, adjustment groove; 300, upper mold; 301, upper module; 400, core block; 401, demolding cavity; 402, sliding groove; 4021, horizontal section; 4022, spiral section; 403, extension hole; 404, rotating seat cover; 405, concealed. Cavity; 406, Lifting block; 407, Connecting groove; 408, Linkage rod; 409, Mounting hole; 500, Demolding assembly; 501, Rotating part; 502, Lifting part; 503, Telescopic assembly; 504, Protruding column; 505, Driven gear ring; 506, Drive groove; 600, Demolding drive assembly; 601, Prime gear; 602, Main shaft; 603, Cage; 604, Cage rod; 605, Spiral groove; 606, Return spring; 700, Mandrel. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] During the process of pressing powder using a mold, after the powder is pressed into shape, there is usually a certain degree of adhesion between the powder and the mold surface. The main reasons for this are as follows:

[0043] First, the powder particles themselves have irregular shapes, and plastic deformation occurs during pressing, forming a mechanical interlock between particles and between particles and the mold surface. Even after polishing, the mold surface still has a microscopic uneven structure, and the deformed powder will embed itself into these microscopic grooves, forming a strong mechanical interlock;

[0044] Secondly, during the pressing process, the powder particles are extremely close to the mold surface, and the intermolecular van der Waals forces and electrostatic forces begin to play a role. The powder may generate static electricity under high pressure, forming electrostatic adsorption with the mold surface, which further enhances the adhesion.

[0045] Due to the aforementioned reasons, the demolding process encounters certain obstacles. To simplify and improve the demolding process, this invention proposes the following technical solution:

[0046] Please see Figure 1 - Figure 13This application proposes a powder metallurgy pressing mold that facilitates material discharge, including a base 100, a lower mold 200 and an upper mold 300 arranged sequentially from bottom to top. Four columns 101 are vertically arranged on the top surface of the base 100. The lower mold 200 is fixedly connected to the columns 101, and the upper mold 300 is slidably engaged with the columns 101, that is, the upper mold 300 and the lower mold 200 can move closer to or further away from each other.

[0047] A molding channel is provided through the middle of the top surface of the lower mold 200, and a core block 400 that can slide vertically is provided in the molding channel. An upper module 301 is provided on the bottom surface of the upper mold 300, directly opposite the molding channel. When the upper module 301 extends into the molding channel, the upper module 301 and the core block 400 can jointly press the powder into a block. When the powder fills the molding channel, the powder is all located above the core block 400 because the outer surface of the core block 400 is in close contact with the inner wall of the molding channel. At this time, the upper mold 300 carries the upper module 301 and embeds it into the molding channel, so that the powder can be pressed into a block under the joint pressure of the upper module 301 and the core block 400.

[0048] Furthermore, the upper surface of the core block 400 is provided with an annular demolding cavity 401, and a demolding assembly 500 is provided inside the demolding cavity 401. In the powder pressing state, the top surface of the demolding assembly 500 is flush with the upper surface of the core block 400. The core block 400 is also provided with a demolding drive assembly 600, which is used to control the demolding assembly 500 to rotate and then lift during the upward lifting process of the core block 400, so that the pressed product can be separated from the core block 400. When the demolding assembly 500 rotates, it can overcome the adhesion between itself and the molded product; when the demolding assembly 500 rises, it can separate the product from the rest of the surface of the core block 400, thereby easily achieving the demolding effect.

[0049] In some embodiments, a mandrel 700 is vertically provided on the top surface of the base 100, and the top end of the mandrel 700 extends into the molding channel and is flush with the top surface of the lower mold 200; that is, the product after pressing and molding is ring-shaped.

[0050] The bottom end of the forming channel is provided with a bottom cover 201, such as Figure 2 As shown, a tension spring 202 that is always in a stretched state is connected between the bottom cover 201 and the core block 400; that is, the two ends of the tension spring 202 are fixedly connected to the core block 400 and the bottom cover 201 respectively. Specifically, the tension spring 202 is welded to the bottom surface of the core block 400 and fixed to the bottom cover 201 by bolts.

[0051] like Figure 2As shown, a pusher 102 is provided between the base 100 and the lower mold 200. The top surface of the pusher 102 is vertically provided with a pusher 103 and a puller 104. The top end of the pusher 103 passes through the bottom cover 201 and extends into the molding channel. The top end of the pusher 103 abuts against the bottom surface of the core block 400. The puller 104 passes through the lower mold 200, and the top end of the puller 104 is connected to the upper mold 300 through a traction rope 105. Therefore, under the pulling force of the spring 202, the core block 400 is always in contact with the top of the push column 103. It should be noted that when the push part 102 and the base 100 are in contact and the traction rope 105 is just taut, the upper module 301 is still located above the molding channel so that the operator can pour the powder into the molding channel. In this state, when the upper mold 300 rises, it can pull the push part 102 to rise, thereby driving the core block 400 to rise. When the upper mold 300 falls, the core block 400 can remain stationary.

[0052] On the other hand, the demolding assembly 500 includes a rotating part 501 that is in the shape of a ring and a lifting part 502 located above the rotating part 501. Multiple telescopic components 503 are provided between the rotating part 501 and the lifting part 502. The telescopic component 503 is composed of two interlocking round tubes, and the two round tubes are respectively connected to the rotating part 501 and the lifting part 502. Therefore, the rotating part 501 and the lifting part 502 cannot be twisted relative to each other, but can move relative to each other vertically.

[0053] Furthermore, the outer surface of the lifting part 502 is provided with a protrusion 504, and the inner surface of the demolding cavity 401 is provided with a sliding groove 402 for the protrusion 504 to be inserted. The sliding groove 402 includes a horizontal section 4021 and a spiral section 4022. When the protrusion 504 is located inside the horizontal section 4021, the top surface of the lifting part 502 is flush with the upper surface of the core block 400. When the protrusion 504 enters the spiral section 4022, the top surface of the lifting part 502 is higher than the upper surface of the core block 400. When the protrusion 504 slides in the horizontal section 4021, the top surface of the lifting part 502 is always flush with the upper surface of the core block 400. When the protrusion 504 slides in the spiral section 4022, the lifting part 502 rotates synchronously with the rotating part 501 while being able to move vertically.

[0054] In some embodiments of this application, the core block 400 is further provided with an installation groove communicating with the demolding cavity 401, and a driven gear ring 505 is provided on the surface of the rotating part 501 facing the installation groove; the demolding drive assembly 600 includes a driving gear 601 rotatably disposed in the installation groove and meshing with the driven gear ring 505, and an extension hole 403 communicating with the installation groove is provided at the bottom of the core block 400. A main shaft 602 is rotatably disposed in the extension hole 403, the top end of the main shaft 602 is coaxially connected with the driving gear 601, and the bottom end of the main shaft 602 extends out below the extension hole 403; therefore, when the main shaft 602 rotates, it can indirectly drive the rotating part 501 to rotate; specifically, a rotating seat cover 404 is provided at the bottom end of the extension hole 403, the main shaft 602 and the rotating seat cover 404 are rotatably engaged by bearings, and the rotating seat cover 404 and the bottom surface of the core block 400 are bolted together and fixed.

[0055] In this embodiment, the demolding drive assembly 600 further includes a retainer 603 disposed on the bottom surface of the core block 400. A retainer rod 604 is slidably disposed vertically inside the retainer 603. The retainer rod 604 itself is distributed horizontally. A spiral groove 605 is formed on the bottom outer surface of the main shaft 602. An adjustment groove 203 is formed vertically on one side of the inner wall of the molding channel. The two ends of the retainer rod 604 are respectively embedded in the spiral groove 605 and the adjustment groove 203. It should be noted that the bottom end of the adjustment groove 203 is flush with the bottom surface of the core block 400, and the top end of the adjustment groove 203 is a certain distance from the top surface of the core block 400.

[0056] Furthermore, a return spring 606 is also provided between the retainer 603 and the retaining rod 604, such as... Figure 10 As shown, in its natural state, the return spring 606 is compressed, and the retaining rod 604 is located at the upper end of the retainer 603. This means the return spring 606 always applies an upward thrust to the retaining rod 604. During the upward lifting of the core block 400, when the retaining rod 604 abuts against the top of the adjusting groove 203, it can move downward along the spiral groove 605, causing the demolding assembly 500 to rotate. This indirectly causes the lifting part 502 to rotate first and then rise, ejecting the molded product.

[0057] It should also be noted that in the initial state, the protrusion 504 is located in the horizontal section 4021, and when the retaining rod 604 moves downward along the spiral groove 605, the protrusion 504 can first slide in the horizontal section 4021, and then continue to slide in the spiral section 4022; when the core block 400 descends, under the action of the return spring 606, the retaining rod 604 can move upward relative to the retainer 603, thereby restoring the demolding assembly 500 to its original position.

[0058] In addition, to ensure that the demolding assembly 500 can be smoothly installed into the demolding cavity 401, the protrusion 504 in this embodiment can adopt a spring pin structure. In its natural state, one end of the protrusion 504 extends out of the outer surface of the lifting part 502. When an inward pushing force is applied, the protrusion 504 can be completely embedded into the lifting part 502, and then the rotating part 501 and the lifting part 502 can be pushed into the demolding cavity 401 together. To facilitate the disassembly of the demolding assembly 500, the end of the spiral segment 4022 can be designed to gradually become shallower, so that when the protrusion 504 slides to the end of the spiral segment 4022, the protrusion 504 can automatically retract into the lifting part 502. However, it should be noted that since one end of the retaining rod 604 is always embedded in the spiral groove 605, the rotation range of the lifting part 502 is limited. Within this limited rotation range, the protrusion 504 will not enter the end position of the spiral segment 4022.

[0059] In order to prevent the rotating part 501 from moving vertically during the rotation of the demolding assembly 500, this embodiment can also install a bearing on the outer surface of the rotating part 501, and the outer ring of the bearing is interference-fitted with the inner wall of the demolding cavity 401. The advantage of this design is that the rotating part 501 can only rotate and cannot move linearly. The disadvantage is that the installation and disassembly of the demolding assembly 500 are relatively difficult.

[0060] In practical applications, this embodiment, in its initial state, is as follows: Figure 2 As shown, the upper module 301 is located above the molding channel, and the core block 400 is completely retracted into the molding channel. At this time, the operator pours a certain amount of powder into the molding channel, and then applies downward pressure to the upper mold 300 (driven by an external hydraulic mechanism). Under the joint pressure of the upper module 301 and the core block 400, the powder is pressed into a block.

[0061] Subsequently, the upper mold 300 rises, and when the traction rope 105 is taut, it will drive the core block 400 to rise synchronously. During the rise of the core block 400, the molded product is continuously pushed upward. When the upper end of the retaining rod 604 and the adjusting groove 203 abuts, the retaining rod 604 will slide downward along the spiral groove 605, thereby indirectly causing the demolding assembly 500 to rotate. When the protrusion slides along the sliding groove 402, the lifting part 502 performs a rotation and then rise action. When the lifting part 502 rotates, it can overcome the adhesive force between itself and the molded product. When the lifting part 502 rises, the molded product will separate from the rest of the upper surface of the core block 400. When the retaining rod 604 moves to the lower end of the spiral groove 605, the upper mold 300 stops rising. At this time, the molded product protrudes from the upper surface of the lower mold 200, and the operator can easily remove the product without effort or damage.

[0062] Finally, the upper mold 300 returns to its original position, and the core block 400, under the action of the pulling spring 202, can also return to its initial position for continued use next time.

[0063] In another embodiment of this application, hidden cavities 405 are symmetrically formed on opposite sides and near the edge of the upper surface of the core block 400. A lifting block 406 is embedded within the hidden cavity 405. When the lifting block 406 is fully embedded in the hidden cavity 405, its top surface is flush with the upper surface of the core block 400. A connecting groove 407 is formed between the hidden cavity 405 and the demolding cavity 401. A linkage rod 408 is provided on the lifting block 406. An annular drive groove 506 is formed on the outer surface of the lifting part 502. One end of the linkage rod 408 passes through the connecting groove 407 and extends into the drive groove 506. A mounting hole 409 communicating with the hidden cavity 405 is formed on the outer surface of the core block 400. The mounting hole 409 is directly opposite the connecting groove 407. The linkage rod 408 is inserted into the lifting block 406 through the mounting hole 409 and threadedly connected and fixed thereto.

[0064] The inner walls of the lifting block 406 and the concealed cavity 405 are also tightly fitted to prevent powder from embedding into the concealed cavity 405. In addition, the height of the drive groove 506 is matched with the diameter of the linkage rod 408, that is, when the lifting part 502 rotates, the lifting block 406 will not move; however, when the lifting part 502 moves vertically, the lifting block 406 can move synchronously.

[0065] Since the lifting part 502 is located in the center of the core block 400, when the lifting part 502 rises alone, the edge part of the molded product still has a large adhesive force with the core block 400, which may cause the molded product to break during the rise. In this embodiment, the lifting part 502 and the lifting block 406 rise synchronously, which is equivalent to applying an upward thrust to the middle and edge parts of the molded product at the same time. The force is more even and it is less likely to damage the molded product.

[0066] It should be noted that during the demolding operation in this embodiment, when the core block 400 rises to the top position, the lifting part 502 and the lifting block 406 simultaneously lift the molded product. At this time, when the worker takes the molded product, there may be a certain adhesive force between the molded product and the lifting block 406. However, since the surface area of ​​the lifting block 406 is small, the adhesive force is usually small. The worker can take out the product by applying a little external force.

[0067] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0068] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A powder metallurgy pressing mold for easy material discharge, comprising a base, a lower mold, and an upper mold arranged sequentially from bottom to top, wherein multiple columns are vertically arranged on the top surface of the base, the lower mold is fixedly connected to the columns, and the upper mold is slidably engaged with the columns, characterized in that: A forming channel is provided through the middle of the top surface of the lower mold, and a core block that can slide vertically is provided in the forming channel. The upper module is provided on the bottom surface of the upper mold and directly opposite the molding channel. When the upper module extends into the molding channel, the upper module and the core block can work together to press the powder into a block. The upper surface of the core block is provided with an annular demolding cavity, and a demolding component is provided inside the demolding cavity. In the powder pressing state, the top surface of the demolding component is flush with the upper surface of the core block. The core block is also provided with a demolding drive assembly, which is used to control the demolding assembly to rotate and then lift during the upward lifting process of the core block, so that the pressed and formed product can be separated from the core block; The demolding assembly includes a rotating part that is ring-shaped and a lifting part located above the rotating part, and multiple telescopic components are provided between the rotating part and the lifting part; The outer surface of the lifting part is provided with a protruding post, and the inner surface of the demolding cavity is provided with a sliding groove for the protruding post to be inserted. The sliding groove includes a horizontal section and a spiral section. When the protruding post is located inside the horizontal section, the top surface of the lifting part is flush with the upper surface of the core block. When the protruding post enters the spiral section, the top surface of the lifting part is higher than the upper surface of the core block. The core block is also provided with an installation groove that communicates with the demolding cavity, and the rotating part is provided with a driven gear ring on the surface facing the installation groove. The demolding drive assembly includes a prime gear that is rotatably disposed in the mounting slot and meshes with the driven gear ring. The bottom of the core block is also provided with an extension hole communicating with the mounting slot. A main shaft is rotatably disposed in the extension hole. The top end of the main shaft is coaxially connected to the prime gear, and the bottom end of the main shaft extends out below the extension hole. The demolding drive assembly also includes a retainer disposed on the bottom surface of the core block, a retaining rod slidably disposed in the retainer along the vertical direction, a spiral groove is formed on the bottom outer surface of the main shaft, an adjustment groove is formed on one side of the inner wall of the forming channel along the vertical direction, and the two ends of the retaining rod are respectively embedded in the spiral groove and the adjustment groove; A return spring is also provided between the retainer and the retaining rod. In its natural state, the return spring is in a compressed state, and the retaining rod is located at the upper end of the inside of the retainer. During the upward lifting of the core block, when the retaining rod abuts against the top of the adjusting groove, the retaining rod can move downward along the spiral groove to make the demolding assembly rotate.

2. The powder metallurgy pressing mold for easy material discharge according to claim 1, characterized in that: The top surface of the base is vertically provided with a mandrel, the top end of which extends into the molding channel and is flush with the top surface of the lower mold.

3. A powder metallurgy pressing mold for easy material discharge according to claim 1 or 2, characterized in that: The bottom end of the forming channel is provided with a bottom cover, and a tension spring that is always in a stretched state is connected between the bottom cover and the core block; A pusher is provided between the base and the lower mold. A pusher and a puller are vertically provided on the top surface of the pusher. The top of the pusher penetrates the bottom cover and extends into the molding channel. The top of the pusher abuts against the bottom surface of the core block. The puller penetrates the lower mold and the top of the puller is connected to the upper mold by a traction rope.

4. The powder metallurgy pressing mold for easy material discharge according to claim 1, characterized in that: The upper surface of the core block has symmetrically formed hidden cavities on both sides and near the edge. A lifting block is embedded in the hidden cavity. When the lifting block is fully embedded in the hidden cavity, the top surface of the lifting block is flush with the upper surface of the core block.

5. A powder metallurgy pressing mold for easy material discharge according to claim 4, characterized in that: A connecting groove is provided between the hidden cavity and the demolding cavity. A linkage rod is provided on the lifting block. A ring-shaped drive groove is provided on the outer surface of the lifting part. One end of the linkage rod passes through the connecting groove and extends into the drive groove.

6. The powder metallurgy pressing mold for easy material discharge according to claim 1, characterized in that: The bottom end of the extension hole is provided with a rotating seat cover, and the main shaft is rotatably engaged with the rotating seat cover.

7. A powder metallurgy pressing mold for easy material discharge according to claim 5, characterized in that: The outer surface of the core block has an installation hole that communicates with the hidden cavity. The installation hole and the connecting groove are directly opposite each other. The linkage rod is inserted into the lifting block through the installation hole and is threadedly connected and fixed to it.

Images